Android拦截并获取WebView内部POST请求参数的实现方法

webView.setWebViewClient(new WebViewClient() {
  @Override
  public WebResourceResponse shouldInterceptRequest(WebView view, WebResourceRequest request) {
    try {
      URL url = new URL(request.getUrl());
    } catch (MalformedURLException e) {
      e.printStackTrace();
    }
    Log.e("InternetActivity", request + "");
    return super.shouldInterceptRequest(view, request);
  }

});

<script language="JavaScript">
  function generateRandom() {
   return Math.floor((1 + Math.random()) * 0x10000)
    .toString(16)
    .substring(1);
  }
  // This only works if `open` and `send` are called in a synchronous way
  // That is, after calling `open`, there must be no other call to `open` or
  // `send` from another place of the code until the matching `send` is called.
  requestID = null;
  XMLHttpRequest.prototype.reallyOpen = XMLHttpRequest.prototype.open;
  XMLHttpRequest.prototype.open = function(method, url, async, user, password) {
    requestID = generateRandom()
    var signed_url = url + "AJAXINTERCEPT" + requestID;
    this.reallyOpen(method, signed_url , async, user, password);
  };
  XMLHttpRequest.prototype.reallySend = XMLHttpRequest.prototype.send;
  XMLHttpRequest.prototype.send = function(body) {
    interception.customAjax(requestID, body);
    this.reallySend(body);
  };
</script>

@Override
public final WebResourceResponse shouldInterceptRequest(final WebView view, WebResourceRequest request) {
  String requestBody = null;
  Uri uri = request.getUrl();
  // 判断是否为Ajax请求（只要链接中包含AJAXINTERCEPT即是）
  if (isAjaxRequest(request)) {
    // 获取post请求参数
    requestBody = getRequestBody(request);
    // 获取原链接
    uri = getOriginalRequestUri(request, MARKER);
  }
  // 重新构造请求，并获取response
  WebResourceResponse webResourceResponse = shouldInterceptRequest(view, new WriteHandlingWebResourceRequest(request, requestBody, uri));
  if (webResourceResponse == null) {
    return webResourceResponse;
  } else {
    return injectIntercept(webResourceResponse, view.getContext());
  }
}

private WebResourceResponse injectIntercept(WebResourceResponse response, Context context) {
  String encoding = response.getEncoding();
  String mime = response.getMimeType();
  // WebResourceResponse的mime必须为"text/html",不能是"text/html; charset=utf-8"
  if (mime.contains("text/html")) {
    mime = "text/html";
  }
  InputStream responseData = response.getData();
  InputStream injectedResponseData = injectInterceptToStream(
      context,
      responseData,
      mime,
      encoding
  );
  return new WebResourceResponse(mime, encoding, injectedResponseData);
}